package com.hmdp.service.impl;

import ch.qos.logback.core.util.TimeUtil;
import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.RegexUtils.isPhoneInvalid;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1,检验手机号是否正确
        if (isPhoneInvalid(phone)){
            return Result.fail("手机格式错误");
        }
        //符合,生成验证码
        String code = RandomUtil.randomNumbers(6);

        //存入到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //发送验证码
        log.debug("验证码为:{}",code);

        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {

        String phone = loginForm.getPhone();
        //1,验证手机号
        if (isPhoneInvalid(phone)){
            return Result.fail("手机格式错误");
        }

        //3.校验验证码,redis
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();

        if ( !cacheCode.equals(code) || cacheCode == null){
            return Result.fail("验证码错误");
        }

        //4.根据手机号查询用户
        User user = query().eq("phone", phone).one();

        //5.判断是否存在
        if ( user == null){
            //6.不存在,创建一个新用户
            user = createWithPhone(phone);
        }

        //7.保存用户到redis
        //7.1 随机生成token,做登录令牌
        String token = UUID.randomUUID().toString(true);//表示生成的字符串不包含_

        //7.2 将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fileName,fileValue)->fileValue.toString()));

        //7,3 存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);

        //7.4 设置有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);

        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        //拼接key
        String key = USER_SIGN_KEY + userId + keySuffix;
        //获取在这个月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //写入Redis
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth -1 , true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        //拼接key
        String key = USER_SIGN_KEY + userId + keySuffix;
        //获取在这个月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //获取本月截至到今天的所有天数,返回的是一个十进制数字
        List<Long> results = stringRedisTemplate.opsForValue().bitField(key,
                BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth))
                        .valueAt(0)
        );
        if (results == null || results.isEmpty()){
            return Result.ok(0);
        }
        Long num = results.get(0);
        if (num == null || num == 0){
            return Result.ok(0);
        }
        //循环遍历
        int count = 0;
        while (true) {
            //让这个数字和1做与运算,得到最后一个数字的bit位
            //判断这个bit是否为0
            if ((num & 1) == 0) {            //为0结束
                break;
            }else {
                //不为0,计数器+1
                count ++ ;
            }
            num >>>= 1;
        }
        //返回count
        return  Result.ok(count);
    }

    private User createWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
